Bulk steel for the production of injection moulds for plastic material or for the production of pieces for working metals
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United States of America Patent
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N/A
Issued Date -
Jun 2, 2005
app pub date -
Feb 4, 2005
filing date -
Apr 3, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Steel blocks for the manufacture of moulds for the injection moulding of plastics material or for the manufacture of metal-working parts having a thickness greater than 20 mm, of which the structure is completely martensitic or martensito-bainitic, of which the hardness is between 430 HB and 530 HB and of which the chemical composition comprises, in % by weight: 0.180%.ltoreq.C.ltoreq.0.40%; Si.ltoreq.0.8%; Mn.ltoreq.2.5%; Ni.ltoreq.3%; Cr.ltoreq.3.5%; Mo+W/2.ltoreq.2.8%; V+Nb/2+Ta/4.ltoreq.0.5%-; Al.ltoreq.0.4%; Ti+Zr/2.ltoreq.0.1%; 0.0005%
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